transparent symbols

Hello, I attached a sample. I'm trying to plot a line using markers and
I would like those markers to be transparent. I use the keyword
'alpha=0.2' to set the transparency although the marker are not
transparent? Does anyone know how to make this work? Thanks for the

Also, is it possible to set autoscale for just x-axis or just y-axis? I
haven't found a way to do this. Thanks again.

Jeff (4.29 KB)